\begin{longtable}{lccc}
\caption{Balance of plant characteristics by treatment status}
\label{tab:balance} \\
\toprule
                                &Treatment&  Control&Difference         \\
&(1)&(2)&(3)\\
\midrule
\addlinespace
\multicolumn{4}{c}{\textit{Panel A: Plant Measures}} \\
Total electricity cost (1,000 USD)&    467.6&    345.8&    121.9         \\
                                &  [869.0]&  [327.0]&   (78.5)         \\
Log(plant total heat output)    &     15.6&     15.6&    0.012         \\
                                &   [0.62]&   [0.50]&  (0.065)         \\
Size as recorded on environment consent (1 to 3)&     1.37&     1.37&   0.0052         \\
                                &   [0.64]&   [0.62]&  (0.075)         \\
Small-scale (size=1)            &     0.72&     0.71&   0.0063         \\
                                &   [0.45]&   [0.46]&  (0.054)         \\
Large-scale (size=3)            &    0.086&    0.075&    0.011         \\
                                &   [0.28]&   [0.26]&  (0.032)         \\
Number of stacks                &     1.08&     1.04&    0.035         \\
                                &   [0.41]&   [0.21]&  (0.038)         \\
Textiles sector (=1)            &     0.85&     0.87&   -0.025         \\
                                &   [0.36]&   [0.33]&  (0.041)         \\
Gross Sales Revenue in 2017 (1,000 USD)&  13010.5&   9755.0&   3255.5         \\
                                &[43534.7]&[39788.2]& (5043.2)         \\
\addlinespace\addlinespace
\multicolumn{4}{c}{\textit{Panel B: Plant Abatement and Investment Cost}} \\

Boiler house employment         &        36.9&        32.3&        4.62         \\
                                &      [32.9]&      [29.4]&      (3.69)         \\
Boiler house capital expenditure (1,000 USD)&       199.9&       171.4&        28.5         \\
                                &     [405.0]&     [196.6]&      (38.3)         \\
Boiler house operating cost (1,000 USD)&       140.4&       112.4&        28.0         \\
                                &     [206.3]&      [84.2]&      (18.3)         \\
APCD: Cyclone present           &        0.98&        0.97&      0.0100         \\
                                &      [0.14]&      [0.17]&     (0.019)         \\
APCD: Bag ﬁlter present        &        0.80&        0.88&      -0.079\sym{*}  \\
                                &      [0.40]&      [0.33]&     (0.043)         \\
APCD: Scrubber present          &        0.64&        0.61&       0.030         \\
                                &      [0.48]&      [0.49]&     (0.058)         \\
APCD: ESP present               &        0.12&       0.075&       0.045         \\
                                &      [0.33]&      [0.26]&     (0.035)         \\

\addlinespace\addlinespace
\multicolumn{4}{c}{\textit{Panel C: Plant Pollution Measures}} \\

Plant total PM mass rate (kg/hr)&        3.62&        3.60&       0.027         \\
                                &      [4.94]&      [3.82]&      (0.52)         \\
Plant mean PM concentration (mg/Nm\textsuperscript{3})&       179.0&       168.8&        10.2         \\
                                &     [156.1]&     [150.2]&      (18.2)         \\
Plant mean Ringelmann score (1 to 5)&        1.37&        1.35&       0.017         \\
                                &      [0.43]&      [0.37]&     (0.047)         \\
Above regulatory standard at ETS baseline (=1)&        0.34&        0.28&       0.054         \\
                                &      [0.47]&      [0.45]&     (0.055)         \\
\addlinespace\addlinespace
Number of plants & 156 & 136 & \\
\bottomrule\\[-5.2ex]
\insertTableNotes
\end{longtable}
